package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;

/**
 * 用户登录功能
 *
 * 要求:程序启动后要求用户输入用户名和密码
 * 然后使用该用户名和密码作为条件去user表中查询该用户是否存在
 * 如果存在则登录成功,否则登录失败
 *
 */
public class LoginUser {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("欢迎登录");
        System.out.println("请输入用户名:");
        String username = scanner.nextLine();
        System.out.println("请输入密码:");
        String password = scanner.nextLine();

        try (Connection connection = DBUtil.getConnection();){
            Statement statement = connection.createStatement();
            String sql = "SELECT id,username,password,nickname,age " +
                    "FROM user " +
                    "WHERE username='"+username+"' AND password='"+password+"'";
            System.out.println(sql);

            ResultSet rs = statement.executeQuery(sql);
            if (rs.next()) {
                System.out.println("登录成功！");
            } else {
                System.out.println("登录失败！");
            }



        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}







